2010-04-30 18:26:32 +00:00
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/* NS-over-IP proxy */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by On Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <errno.h>
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#include <sys/fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <osmocore/talloc.h>
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#include <osmocore/select.h>
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#include <openbsc/signal.h>
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#include <openbsc/debug.h>
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#include <openbsc/gprs_ns.h>
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#include <openbsc/gprs_bssgp.h>
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2010-05-03 16:54:58 +00:00
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#include <openbsc/gb_proxy.h>
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2010-04-30 18:26:32 +00:00
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struct gbprox_peer {
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struct llist_head list;
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/* NS-VC over which we send/receive data to this BVC */
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struct gprs_nsvc *nsvc;
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/* BVCI used for Point-to-Point to this peer */
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uint16_t bvci;
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/* Routeing Area that this peer is part of (raw 04.08 encoding) */
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uint8_t ra[6];
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};
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/* Linked list of all Gb peers (except SGSN) */
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static LLIST_HEAD(gbprox_bts_peers);
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extern struct gprs_ns_inst *gbprox_nsi;
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/* Find the gbprox_peer by its BVCI */
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static struct gbprox_peer *peer_by_bvci(uint16_t bvci)
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{
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struct gbprox_peer *peer;
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llist_for_each_entry(peer, &gbprox_bts_peers, list) {
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if (peer->bvci == bvci)
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return peer;
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}
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return NULL;
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}
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static struct gbprox_peer *peer_by_nsvc(struct gprs_nsvc *nsvc)
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{
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struct gbprox_peer *peer;
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llist_for_each_entry(peer, &gbprox_bts_peers, list) {
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if (peer->nsvc == nsvc)
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return peer;
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}
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return NULL;
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}
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/* look-up a peer by its Routeing Area Code (RAC) */
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2010-05-01 10:10:57 +00:00
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static struct gbprox_peer *peer_by_rac(const uint8_t *ra)
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2010-04-30 18:26:32 +00:00
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{
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struct gbprox_peer *peer;
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llist_for_each_entry(peer, &gbprox_bts_peers, list) {
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if (!memcmp(&peer->ra, ra, 6))
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return peer;
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}
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return NULL;
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}
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/* look-up a peer by its Location Area Code (LAC) */
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2010-05-01 10:10:57 +00:00
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static struct gbprox_peer *peer_by_lac(const uint8_t *la)
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2010-04-30 18:26:32 +00:00
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{
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struct gbprox_peer *peer;
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llist_for_each_entry(peer, &gbprox_bts_peers, list) {
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if (!memcmp(&peer->ra, la, 5))
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return peer;
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}
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return NULL;
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}
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static struct gbprox_peer *peer_alloc(uint16_t bvci)
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{
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struct gbprox_peer *peer;
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peer = talloc_zero(tall_bsc_ctx, struct gbprox_peer);
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if (!peer)
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return NULL;
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peer->bvci = bvci;
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llist_add(&peer->list, &gbprox_bts_peers);
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return peer;
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}
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static void peer_free(struct gbprox_peer *peer)
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{
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llist_del(&peer->list);
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talloc_free(peer);
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}
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2010-05-03 17:05:10 +00:00
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/* strip off the NS header */
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static void strip_ns_hdr(struct msgb *msg)
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{
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int strip_len = msgb_bssgph(msg) - msg->data;
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msgb_pull(msg, strip_len);
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}
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2010-05-03 17:22:32 +00:00
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/* FIXME: this is copy+paste from gprs_bssgp.c */
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static inline struct msgb *bssgp_msgb_alloc(void)
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{
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return msgb_alloc_headroom(4096, 128, "BSSGP");
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}
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static int bssgp_tx_simple_bvci(uint8_t pdu_type, uint16_t nsei,
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uint16_t bvci, uint16_t ns_bvci)
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{
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struct msgb *msg = bssgp_msgb_alloc();
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struct bssgp_normal_hdr *bgph =
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(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
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uint16_t _bvci;
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msgb_nsei(msg) = nsei;
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msgb_bvci(msg) = ns_bvci;
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bgph->pdu_type = pdu_type;
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_bvci = htons(bvci);
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msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (uint8_t *) &_bvci);
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return gprs_ns_sendmsg(gbprox_nsi, msg);
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}
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2010-05-03 16:54:58 +00:00
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/* feed a message down the NS-VC associated with the specified peer */
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2010-05-03 17:05:10 +00:00
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static int gbprox_relay2sgsn(struct msgb *msg, uint16_t ns_bvci)
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2010-05-03 16:54:58 +00:00
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{
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2010-05-03 17:22:32 +00:00
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DEBUGP(DGPRS, "NSEI=%u proxying to SGSN (NS_BVCI=%u, NSEI=%u)\n",
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2010-05-03 17:28:05 +00:00
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msgb_nsei(msg), ns_bvci, gbcfg.nsip_sgsn_nsei);
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2010-05-03 17:22:32 +00:00
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2010-05-03 16:54:58 +00:00
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msgb_bvci(msg) = ns_bvci;
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msgb_nsei(msg) = gbcfg.nsip_sgsn_nsei;
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2010-05-03 17:05:10 +00:00
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strip_ns_hdr(msg);
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2010-05-03 16:54:58 +00:00
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return gprs_ns_sendmsg(gbprox_nsi, msg);
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}
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2010-04-30 18:26:32 +00:00
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/* feed a message down the NS-VC associated with the specified peer */
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2010-05-03 17:05:10 +00:00
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static int gbprox_relay2peer(struct msgb *msg, struct gbprox_peer *peer,
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2010-04-30 18:26:32 +00:00
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uint16_t ns_bvci)
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{
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2010-05-03 17:22:32 +00:00
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DEBUGP(DGPRS, "NSEI=%u proxying to to BSS (NS_BVCI=%u, NSEI=%u)\n",
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2010-05-03 17:28:05 +00:00
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msgb_nsei(msg), ns_bvci, peer->nsvc->nsei);
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2010-05-03 17:22:32 +00:00
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2010-04-30 18:26:32 +00:00
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msgb_bvci(msg) = ns_bvci;
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msgb_nsei(msg) = peer->nsvc->nsei;
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2010-05-03 17:05:10 +00:00
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strip_ns_hdr(msg);
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2010-04-30 18:26:32 +00:00
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return gprs_ns_sendmsg(gbprox_nsi, msg);
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}
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/* Send a message to a peer identified by ptp_bvci but using ns_bvci
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* in the NS hdr */
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2010-05-03 17:05:10 +00:00
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static int gbprox_relay2bvci(struct msgb *msg, uint16_t ptp_bvci,
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2010-04-30 18:26:32 +00:00
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uint16_t ns_bvci)
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{
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struct gbprox_peer *peer;
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peer = peer_by_bvci(ptp_bvci);
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if (!peer)
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return -ENOENT;
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2010-05-03 17:05:10 +00:00
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return gbprox_relay2peer(msg, peer, ns_bvci);
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2010-04-30 18:26:32 +00:00
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}
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/* Receive an incoming signalling message from a BSS-side NS-VC */
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static int gbprox_rx_sig_from_bss(struct msgb *msg, struct gprs_nsvc *nsvc,
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uint16_t ns_bvci)
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{
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2010-05-03 14:30:59 +00:00
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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2010-04-30 18:26:32 +00:00
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struct tlv_parsed tp;
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uint8_t pdu_type = bgph->pdu_type;
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2010-05-03 14:30:59 +00:00
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int data_len = msgb_bssgp_len(msg) - sizeof(*bgph);
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2010-04-30 18:26:32 +00:00
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struct gbprox_peer *from_peer;
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2010-05-01 10:10:57 +00:00
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struct gprs_ra_id raid;
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2010-04-30 18:26:32 +00:00
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if (ns_bvci != 0) {
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2010-05-03 17:22:32 +00:00
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LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI %u is not signalling\n",
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nsvc->nsei, ns_bvci);
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2010-04-30 18:26:32 +00:00
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return -EINVAL;
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}
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/* we actually should never see those two for BVCI == 0, but double-check
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* just to make sure */
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if (pdu_type == BSSGP_PDUT_UL_UNITDATA ||
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pdu_type == BSSGP_PDUT_DL_UNITDATA) {
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2010-05-03 17:22:32 +00:00
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LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u UNITDATA not allowed in "
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"signalling\n", nsvc->nsei);
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2010-04-30 18:26:32 +00:00
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return -EINVAL;
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}
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bssgp_tlv_parse(&tp, bgph->data, data_len);
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switch (pdu_type) {
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case BSSGP_PDUT_SUSPEND:
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case BSSGP_PDUT_RESUME:
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2010-05-01 10:10:57 +00:00
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/* We implement RAC snooping during SUSPEND/RESUME, since
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* it establishes a relationsip between BVCI/peer and the
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* routeing area code. The snooped information is then
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* used for routing the {SUSPEND,RESUME}_[N]ACK back to
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* the correct BSSGP */
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2010-04-30 18:26:32 +00:00
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if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA))
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goto err_mand_ie;
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from_peer = peer_by_nsvc(nsvc);
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if (!from_peer)
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goto err_no_peer;
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memcpy(&from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA),
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sizeof(&from_peer->ra));
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2010-05-01 10:10:57 +00:00
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gsm48_parse_ra(&raid, &from_peer->ra);
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2010-05-03 17:22:32 +00:00
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DEBUGP(DGPRS, "NSEI=%u RAC snooping: RAC %u/%u/%u/%u behind BVCI=%u, "
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"NSVCI=%u\n", nsvc->nsei, raid.mcc, raid.mnc, raid.lac,
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raid.rac , from_peer->bvci, nsvc->nsvci);
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2010-04-30 18:26:32 +00:00
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/* FIXME: This only supports one BSS per RA */
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break;
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2010-05-03 17:22:32 +00:00
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case BSSGP_PDUT_BVC_RESET:
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/* If we receive a BVC reset on the signalling endpoint, we
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* don't want the SGSN to reset, as the signalling endpoint
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* is common for all point-to-point BVCs (and thus all BTS) */
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if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) {
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uint16_t bvci = ntohs(*(uint16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI));
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if (bvci == 0) {
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/* FIXME: only do this if SGSN is alive! */
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LOGP(DGPRS, LOGL_INFO, "NSEI=%u Sending fake "
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"BVC RESET ACK of BVCI=0\n", nsvc->nsei);
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return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK,
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nsvc->nsei, 0, ns_bvci);
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}
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}
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break;
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2010-04-30 18:26:32 +00:00
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}
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/* Normally, we can simply pass on all signalling messages from BSS to SGSN */
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2010-05-03 17:05:10 +00:00
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return gbprox_relay2sgsn(msg, ns_bvci);
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2010-04-30 18:26:32 +00:00
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err_no_peer:
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err_mand_ie:
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/* FIXME: do something */
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;
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}
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/* Receive paging request from SGSN, we need to relay to proper BSS */
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static int gbprox_rx_paging(struct msgb *msg, struct tlv_parsed *tp,
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struct gprs_nsvc *nsvc, uint16_t ns_bvci)
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{
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struct gbprox_peer *peer;
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if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) {
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uint16_t bvci = ntohs(*(uint16_t *)TLVP_VAL(tp, BSSGP_IE_BVCI));
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2010-05-03 17:05:10 +00:00
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return gbprox_relay2bvci(msg, bvci, ns_bvci);
|
2010-04-30 18:26:32 +00:00
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} else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) {
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peer = peer_by_rac(TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA));
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2010-05-03 17:05:10 +00:00
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return gbprox_relay2peer(msg, peer, ns_bvci);
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2010-04-30 18:26:32 +00:00
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} else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) {
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peer = peer_by_lac(TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA));
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2010-05-03 17:05:10 +00:00
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return gbprox_relay2peer(msg, peer, ns_bvci);
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2010-04-30 18:26:32 +00:00
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} else
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return -EINVAL;
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}
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/* Receive an incoming signalling message from the SGSN-side NS-VC */
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static int gbprox_rx_sig_from_sgsn(struct msgb *msg, struct gprs_nsvc *nsvc,
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uint16_t ns_bvci)
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{
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2010-05-03 14:30:59 +00:00
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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2010-04-30 18:26:32 +00:00
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struct tlv_parsed tp;
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uint8_t pdu_type = bgph->pdu_type;
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2010-05-03 14:30:59 +00:00
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|
|
int data_len = msgb_bssgp_len(msg) - sizeof(*bgph);
|
2010-04-30 18:26:32 +00:00
|
|
|
struct gbprox_peer *peer;
|
|
|
|
uint16_t bvci;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
if (ns_bvci != 0) {
|
2010-05-03 17:22:32 +00:00
|
|
|
LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI %u is not "
|
|
|
|
"signalling\n", nsvc->nsei, ns_bvci);
|
2010-04-30 18:26:32 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* we actually should never see those two for BVCI == 0, but double-check
|
|
|
|
* just to make sure */
|
|
|
|
if (pdu_type == BSSGP_PDUT_UL_UNITDATA ||
|
|
|
|
pdu_type == BSSGP_PDUT_DL_UNITDATA) {
|
2010-05-03 17:22:32 +00:00
|
|
|
LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) UNITDATA not allowed in "
|
|
|
|
"signalling\n", nsvc->nsei);
|
2010-04-30 18:26:32 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = bssgp_tlv_parse(&tp, bgph->data, data_len);
|
|
|
|
|
|
|
|
switch (pdu_type) {
|
|
|
|
case BSSGP_PDUT_FLUSH_LL:
|
|
|
|
case BSSGP_PDUT_BVC_BLOCK_ACK:
|
|
|
|
case BSSGP_PDUT_BVC_UNBLOCK_ACK:
|
|
|
|
case BSSGP_PDUT_BVC_RESET:
|
|
|
|
case BSSGP_PDUT_BVC_RESET_ACK:
|
|
|
|
/* simple case: BVCI IE is mandatory */
|
|
|
|
if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI))
|
|
|
|
goto err_mand_ie;
|
|
|
|
bvci = ntohs(*(uint16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI));
|
2010-05-03 17:05:10 +00:00
|
|
|
rc = gbprox_relay2bvci(msg, bvci, ns_bvci);
|
2010-04-30 18:26:32 +00:00
|
|
|
break;
|
|
|
|
case BSSGP_PDUT_PAGING_PS:
|
|
|
|
case BSSGP_PDUT_PAGING_CS:
|
|
|
|
/* process the paging request (LAC/RAC lookup) */
|
|
|
|
rc = gbprox_rx_paging(msg, &tp, nsvc, ns_bvci);
|
|
|
|
break;
|
|
|
|
case BSSGP_PDUT_STATUS:
|
|
|
|
/* FIXME: Some exception has occurred */
|
2010-05-03 17:22:32 +00:00
|
|
|
LOGP(DGPRS, LOGL_NOTICE,
|
|
|
|
"NSEI=%u(SGSN) STATUS not implemented yet\n", nsvc->nsei);
|
2010-04-30 18:26:32 +00:00
|
|
|
break;
|
|
|
|
/* those only exist in the SGSN -> BSS direction */
|
|
|
|
case BSSGP_PDUT_SUSPEND_ACK:
|
|
|
|
case BSSGP_PDUT_SUSPEND_NACK:
|
|
|
|
case BSSGP_PDUT_RESUME_ACK:
|
|
|
|
case BSSGP_PDUT_RESUME_NACK:
|
|
|
|
/* RAC IE is mandatory */
|
|
|
|
if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA))
|
|
|
|
goto err_mand_ie;
|
|
|
|
peer = peer_by_rac(TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA));
|
|
|
|
if (!peer)
|
|
|
|
goto err_no_peer;
|
2010-05-03 17:05:10 +00:00
|
|
|
rc = gbprox_relay2peer(msg, peer, ns_bvci);
|
2010-04-30 18:26:32 +00:00
|
|
|
break;
|
|
|
|
case BSSGP_PDUT_SGSN_INVOKE_TRACE:
|
2010-05-03 17:22:32 +00:00
|
|
|
LOGP(DGPRS, LOGL_ERROR,
|
|
|
|
"NSEI=%u(SGSN) INVOKE TRACE not supported\n", nsvc->nsei);
|
2010-04-30 18:26:32 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
DEBUGP(DGPRS, "BSSGP PDU type 0x%02x unknown\n", pdu_type);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
err_mand_ie:
|
|
|
|
; /* FIXME: this would pull gprs_bssgp.c in, which in turn has dependencies */
|
|
|
|
//return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
|
|
|
|
err_no_peer:
|
|
|
|
; /* FIXME */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Main input function for Gb proxy */
|
|
|
|
int gbprox_rcvmsg(struct msgb *msg, struct gprs_nsvc *nsvc, uint16_t ns_bvci)
|
|
|
|
{
|
2010-05-03 16:54:58 +00:00
|
|
|
int rc;
|
2010-04-30 18:26:32 +00:00
|
|
|
|
|
|
|
/* Only BVCI=0 messages need special treatment */
|
|
|
|
if (ns_bvci == 0 || ns_bvci == 1) {
|
|
|
|
if (nsvc->remote_end_is_sgsn)
|
2010-05-03 16:54:58 +00:00
|
|
|
rc = gbprox_rx_sig_from_sgsn(msg, nsvc, ns_bvci);
|
2010-04-30 18:26:32 +00:00
|
|
|
else
|
2010-05-03 16:54:58 +00:00
|
|
|
rc = gbprox_rx_sig_from_bss(msg, nsvc, ns_bvci);
|
|
|
|
} else {
|
|
|
|
/* All other BVCI are PTP and thus can be simply forwarded */
|
|
|
|
if (nsvc->remote_end_is_sgsn) {
|
2010-05-03 17:05:10 +00:00
|
|
|
rc = gbprox_relay2sgsn(msg, ns_bvci);
|
2010-05-01 10:10:57 +00:00
|
|
|
} else {
|
2010-05-03 16:54:58 +00:00
|
|
|
struct gbprox_peer *peer = peer_by_bvci(ns_bvci);
|
|
|
|
if (!peer) {
|
|
|
|
LOGP(DGPRS, LOGL_NOTICE, "Allocationg new peer for "
|
|
|
|
"BVCI=%u via NSVC=%u/NSEI=%u\n", ns_bvci,
|
|
|
|
nsvc->nsvci, nsvc->nsei);
|
|
|
|
peer = peer_alloc(ns_bvci);
|
|
|
|
peer->nsvc = nsvc;
|
|
|
|
}
|
2010-05-03 17:05:10 +00:00
|
|
|
rc = gbprox_relay2peer(msg, peer, ns_bvci);
|
2010-05-01 10:10:57 +00:00
|
|
|
}
|
2010-04-30 18:26:32 +00:00
|
|
|
}
|
|
|
|
|
2010-05-03 16:54:58 +00:00
|
|
|
return rc;
|
2010-04-30 18:26:32 +00:00
|
|
|
}
|